Compare editor shows compare for generated dates that are equal

The news feature can add some sample documents. The <mynamespace>:date property is filled with the current date. After editing and changing something in the document the compare editor shows a compare for the dates, but the dates look exactly the same to the editor (see screenshot).

This is the actual difference of the content:

published: 2014-09-25T15:12:29.172+02:00
unpublished: 2014-09-25T15:12:00.000+02:00

The automatically created date has iseconds and milliseconds, but the cms strips those off apparently.

Can be fixed by not adding seconds and milliseconds when creating the sample documents.

Are more features adding sample content with dates? Should be fixed there too.